User's Manual

Intel® 815 Chipset: Graphics Controller PRM, Rev 1.0
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12.3.3. BR02—Clip Rectangle Y1 Address
Memory Offset Address: 40008h
Default: None
Attributes: RO; DWord accessible
BR02 is loaded by either the SETUP_BLT or SETUP_MONO_PATTERN_SL_BLT instructions and is
used with PIXEL_BLT, SCANLINE_BLT, or TEXT_BLT instructions.
31 26 25 0
Reserved. Must
be Zero
Clip Rectangle Y1 Address Bits [25:0]
Bit Descriptions
31:26 Reserved. Must be Zero. The maximum GC graphics address is 64 MB.
25:0 Clip Rectangle Y1 Address Bits [25:0]. These 26 bits specify the top clipping address of the
destination data. This clip compare is inclusive: draw if destination address is greater than or equal to
this address. This address points to the first address of a scan line. The Clip Rectangle X registers
take care of the pixel positions within a scan line.
12.3.4. BR03—Clip Rectangle Y2 Address
Memory Offset Address: 4000Ch
Default: None
Attributes: RO; DWord accessible
BR03 is loaded by either the SETUP_BLT or SETUP_MONO_PATTERN_SL_BLT instructions and is
used with PIXEL_BLT, SCANLINE_BLT, or TEXT_BLT instructions.
31 26 25 0
Reserved. Must
be Zero
Clip Rectangle Y2 Address Bits [25:0]
Bit Descriptions
31:26 Reserved. Must be Zero. The maximum GC graphics address is 64 MBs. Debug implementation
specific = Leftdiscard[11:06]
25:0 Clip Rectangle Y2 Address Bits [25:0]. These 26 bits specify the bottom clipping address of the
destination data. This clip compare is inclusive: draw if destination address is less than or equal to this
address. This address points to the first byte of a scan line. The Clip Rectangle X registers take care
of the pixel positions within a scan line.